关于window.location问题

Question

<asp:Button ID="Button1" runat="server" Text="Button" OnClientClick="javascript:upload()" />这个是按钮js里是
 <script type="text/javascript">        function upload() {
            var curVerID = document.getElementById('upVerTx').value;
            if (curVerID == null || curVerID == "") {
                alert("版本号不能为空");
                return;
            } else {
                var exp = /^\d{1,2}\.\d{1,2}\.\d{1,2}\.\d{1,2}$/;
                var reg = curVerID.match(exp);
                if (reg) {
                    window.location= "UpResfile.aspx?versionID=" + curVerID;
                } else {
                    alert("版本号格式不正确");
                    return;
                }
            }
        }    </script>结果发现很奇怪的现象
window.location= "UpResfile.aspx?versionID=" + curVerID;他不会跳转页面
必须在后面加一个alert方法才会window.location= "UpResfile.aspx?versionID=" + curVerID;
alert（1）;
这样他就会跳转
哪位大侠指教下
谢谢啦

Answer 1

OnClientClick="return upload()" 

Answer 2

window.location= "UpResfile.aspx?versionID=" + curVerID;
出了安全机制，浏览器都禁了。会弹出阻止对话框///

Answer 3

OnClientClick="upload();return false;" />

Answer 4

OnClientClick="location.href='default.aspx';return false;" 

Answer 5

OnClientClick="upload();return false;“
谢谢啦！